1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/ioport.h>
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/platform_device.h>
20#include <linux/gpio.h>
21#include <linux/bitops.h>
22#include <linux/io.h>
23
24#define DRV_NAME "gpio-sch311x"
25
26#define SCH311X_GPIO_CONF_OUT 0x00
27#define SCH311X_GPIO_CONF_IN 0x01
28#define SCH311X_GPIO_CONF_INVERT 0x02
29#define SCH311X_GPIO_CONF_OPEN_DRAIN 0x80
30
31#define SIO_CONFIG_KEY_ENTER 0x55
32#define SIO_CONFIG_KEY_EXIT 0xaa
33
34#define GP1 0x4b
35
36static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e };
37
38static struct platform_device *sch311x_gpio_pdev;
39
40struct sch311x_pdev_data {
41 unsigned short runtime_reg;
42};
43
44struct sch311x_gpio_block {
45 struct gpio_chip chip;
46 unsigned short data_reg;
47 unsigned short *config_regs;
48 unsigned short runtime_reg;
49 spinlock_t lock;
50};
51
52struct sch311x_gpio_priv {
53 struct sch311x_gpio_block blocks[6];
54};
55
56struct sch311x_gpio_block_def {
57 unsigned short data_reg;
58 unsigned short config_regs[8];
59 unsigned short base;
60};
61
62
63
64static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = {
65 {
66 .data_reg = 0x4b,
67 .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b},
68 .base = 10,
69 },
70 {
71 .data_reg = 0x4c,
72 .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32},
73 .base = 20,
74 },
75 {
76 .data_reg = 0x4d,
77 .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a},
78 .base = 30,
79 },
80 {
81 .data_reg = 0x4e,
82 .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73},
83 .base = 40,
84 },
85 {
86 .data_reg = 0x4f,
87 .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46},
88 .base = 50,
89 },
90 {
91 .data_reg = 0x50,
92 .config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59},
93 .base = 60,
94 },
95};
96
97
98
99
100
101static inline int sch311x_sio_enter(int sio_config_port)
102{
103
104 if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) {
105 pr_err(DRV_NAME "I/O address 0x%04x already in use\n",
106 sio_config_port);
107 return -EBUSY;
108 }
109
110 outb(SIO_CONFIG_KEY_ENTER, sio_config_port);
111 return 0;
112}
113
114static inline void sch311x_sio_exit(int sio_config_port)
115{
116 outb(SIO_CONFIG_KEY_EXIT, sio_config_port);
117 release_region(sio_config_port, 2);
118}
119
120static inline int sch311x_sio_inb(int sio_config_port, int reg)
121{
122 outb(reg, sio_config_port);
123 return inb(sio_config_port + 1);
124}
125
126static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
127{
128 outb(reg, sio_config_port);
129 outb(val, sio_config_port + 1);
130}
131
132
133
134
135
136
137static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset)
138{
139 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
140
141 if (block->config_regs[offset] == 0)
142 return -ENODEV;
143
144 if (!request_region(block->runtime_reg + block->config_regs[offset],
145 1, DRV_NAME)) {
146 dev_err(chip->parent, "Failed to request region 0x%04x.\n",
147 block->runtime_reg + block->config_regs[offset]);
148 return -EBUSY;
149 }
150 return 0;
151}
152
153static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset)
154{
155 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
156
157 if (block->config_regs[offset] == 0)
158 return;
159
160 release_region(block->runtime_reg + block->config_regs[offset], 1);
161}
162
163static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset)
164{
165 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
166 unsigned char data;
167
168 spin_lock(&block->lock);
169 data = inb(block->runtime_reg + block->data_reg);
170 spin_unlock(&block->lock);
171
172 return !!(data & BIT(offset));
173}
174
175static void __sch311x_gpio_set(struct sch311x_gpio_block *block,
176 unsigned offset, int value)
177{
178 unsigned char data = inb(block->runtime_reg + block->data_reg);
179 if (value)
180 data |= BIT(offset);
181 else
182 data &= ~BIT(offset);
183 outb(data, block->runtime_reg + block->data_reg);
184}
185
186static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset,
187 int value)
188{
189 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
190
191 spin_lock(&block->lock);
192 __sch311x_gpio_set(block, offset, value);
193 spin_unlock(&block->lock);
194}
195
196static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
197{
198 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
199
200 spin_lock(&block->lock);
201 outb(SCH311X_GPIO_CONF_IN, block->runtime_reg +
202 block->config_regs[offset]);
203 spin_unlock(&block->lock);
204
205 return 0;
206}
207
208static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
209 int value)
210{
211 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
212
213 spin_lock(&block->lock);
214
215 outb(SCH311X_GPIO_CONF_OUT, block->runtime_reg +
216 block->config_regs[offset]);
217
218 __sch311x_gpio_set(block, offset, value);
219
220 spin_unlock(&block->lock);
221 return 0;
222}
223
224static int sch311x_gpio_probe(struct platform_device *pdev)
225{
226 struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev);
227 struct sch311x_gpio_priv *priv;
228 struct sch311x_gpio_block *block;
229 int err, i;
230
231
232 if (!devm_request_region(&pdev->dev, pdata->runtime_reg + GP1, 6,
233 DRV_NAME)) {
234 dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n",
235 pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5);
236 return -EBUSY;
237 }
238
239 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
240 if (!priv)
241 return -ENOMEM;
242
243 platform_set_drvdata(pdev, priv);
244
245 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
246 block = &priv->blocks[i];
247
248 spin_lock_init(&block->lock);
249
250 block->chip.label = DRV_NAME;
251 block->chip.owner = THIS_MODULE;
252 block->chip.request = sch311x_gpio_request;
253 block->chip.free = sch311x_gpio_free;
254 block->chip.direction_input = sch311x_gpio_direction_in;
255 block->chip.direction_output = sch311x_gpio_direction_out;
256 block->chip.get = sch311x_gpio_get;
257 block->chip.set = sch311x_gpio_set;
258 block->chip.ngpio = 8;
259 block->chip.parent = &pdev->dev;
260 block->chip.base = sch311x_gpio_blocks[i].base;
261 block->config_regs = sch311x_gpio_blocks[i].config_regs;
262 block->data_reg = sch311x_gpio_blocks[i].data_reg;
263 block->runtime_reg = pdata->runtime_reg;
264
265 err = gpiochip_add_data(&block->chip, block);
266 if (err < 0) {
267 dev_err(&pdev->dev,
268 "Could not register gpiochip, %d\n", err);
269 goto exit_err;
270 }
271 dev_info(&pdev->dev,
272 "SMSC SCH311x GPIO block %d registered.\n", i);
273 }
274
275 return 0;
276
277exit_err:
278
279 for (--i; i >= 0; i--)
280 gpiochip_remove(&priv->blocks[i].chip);
281 return err;
282}
283
284static int sch311x_gpio_remove(struct platform_device *pdev)
285{
286 struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev);
287 int i;
288
289 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
290 gpiochip_remove(&priv->blocks[i].chip);
291 dev_info(&pdev->dev,
292 "SMSC SCH311x GPIO block %d unregistered.\n", i);
293 }
294 return 0;
295}
296
297static struct platform_driver sch311x_gpio_driver = {
298 .driver.name = DRV_NAME,
299 .probe = sch311x_gpio_probe,
300 .remove = sch311x_gpio_remove,
301};
302
303
304
305
306
307
308static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
309{
310 int err = 0, reg;
311 unsigned short base_addr;
312 unsigned char dev_id;
313
314 err = sch311x_sio_enter(sio_config_port);
315 if (err)
316 return err;
317
318
319 reg = sch311x_sio_inb(sio_config_port, 0x20);
320 switch (reg) {
321 case 0x7c:
322 dev_id = 2;
323 break;
324 case 0x7d:
325 dev_id = 4;
326 break;
327 case 0x7f:
328 dev_id = 6;
329 break;
330 default:
331 err = -ENODEV;
332 goto exit;
333 }
334
335
336 sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
337
338
339 if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
340 pr_info("Seems that LDN 0x0a is not active...\n");
341
342
343 base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
344 sch311x_sio_inb(sio_config_port, 0x61);
345 if (!base_addr) {
346 pr_err("Base address not set\n");
347 err = -ENODEV;
348 goto exit;
349 }
350 *addr = base_addr;
351
352 pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
353
354exit:
355 sch311x_sio_exit(sio_config_port);
356 return err;
357}
358
359static int __init sch311x_gpio_pdev_add(const unsigned short addr)
360{
361 struct sch311x_pdev_data pdata;
362 int err;
363
364 pdata.runtime_reg = addr;
365
366 sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);
367 if (!sch311x_gpio_pdev)
368 return -ENOMEM;
369
370 err = platform_device_add_data(sch311x_gpio_pdev,
371 &pdata, sizeof(pdata));
372 if (err) {
373 pr_err(DRV_NAME "Platform data allocation failed\n");
374 goto err;
375 }
376
377 err = platform_device_add(sch311x_gpio_pdev);
378 if (err) {
379 pr_err(DRV_NAME "Device addition failed\n");
380 goto err;
381 }
382 return 0;
383
384err:
385 platform_device_put(sch311x_gpio_pdev);
386 return err;
387}
388
389static int __init sch311x_gpio_init(void)
390{
391 int err, i;
392 unsigned short addr = 0;
393
394 for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++)
395 if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
396 break;
397
398 if (!addr)
399 return -ENODEV;
400
401 err = platform_driver_register(&sch311x_gpio_driver);
402 if (err)
403 return err;
404
405 err = sch311x_gpio_pdev_add(addr);
406 if (err)
407 goto unreg_platform_driver;
408
409 return 0;
410
411unreg_platform_driver:
412 platform_driver_unregister(&sch311x_gpio_driver);
413 return err;
414}
415
416static void __exit sch311x_gpio_exit(void)
417{
418 platform_device_unregister(sch311x_gpio_pdev);
419 platform_driver_unregister(&sch311x_gpio_driver);
420}
421
422module_init(sch311x_gpio_init);
423module_exit(sch311x_gpio_exit);
424
425MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>");
426MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver");
427MODULE_LICENSE("GPL");
428MODULE_ALIAS("platform:gpio-sch311x");
429
